反应详情

A mixture of N-[6-(3-aminophenoxy)-7-cyano-1,3-benzothiazol-2-yl]acetamide (150 mg, 0.462 mmol) produced in Example 12(ii), 3-(1-cyano-1-methylethoxy)benzoic acid (114 mg, 0.555 mmol), O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (211 mg, 0.554 mmol), and pyridine (2 mL)/N,N-dimethylacetamide (1.2 mL) was stirred at room temperature for 6 hr. The reaction mixture was diluted with ethyl acetate (10 ml), washed successively with 5% aqueous sodium hydrogen carbonate solution (5 ml) and saturated brine (5 mL), and dried over anhydrous sodium sulfate. Insoluble material was filtered off, and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/n-hexane=30/70→80/20), and the obtained solution was concentrated under reduced pressure. The residue was recrystallized from ethanol to give the title compound (162 mg, 69%) as a white powder.

1. washwashed successively with 5% aqueous sodium hydrogen carbonate solution (5 ml) and saturated brine (5 mL)
2. dry with materialdried over anhydrous sodium sulfate
3. filtrationInsoluble material was filtered off
4. concentrationthe filtrate was concentrated under reduced pressure
5. customThe residue was purified by silica gel column chromatography (ethyl acetate/n-hexane=30/70→80/20)
6. concentrationthe obtained solution was concentrated under reduced pressure
7. customThe residue was recrystallized from ethanol